GRETA VAN SUSTEREN: Just to clarify, if he sits down in the U.S. Senate this is over?

MIKE LEE: That's right, he can't sit down, not even for a moment. He can't leave the floor, not even to use the restroom, not even for a moment.

GRETA VAN SUSTEREN: How long do you think he can last?

MIKE LEE: Rand is a fighter, you know, who knows? The record for an individual filibuster in the the United States Senate is 24 hours and 18 minutes. And I wouldn't put it past Rand Paul to be able to break that.